i = int(input('输入：'))
lis = [21, 45, 98, 55, 88, 102]
for j in range(len(lis)+1):
    if j == len(lis):
        print('没找到')
        break
    elif i == lis[j]:
        print(f'{lis[j]}是列表的第{j + 1}个数')
        break

for k in range(1, 100):
    if k % 2 == 1:
        continue
    else:
        print(k)